Improvement in sewing-machines



'Nrrnn `Srrirns PATENT rFIon.

SAMUEL S. BLACK, OF WEST ALEXANDRIA, OHIO, ASSIGNOR OF THREE- FOURTHS HIS RIGHT TO JOHN BLACK, SAMUEL BLACK, AND L. C;

BLACK, OF SAME PLACE.

Specification forming part of Letters Patent No. 146,642, dated January 510, 1.8? 4 application iiled November 1,1573.

To all whom it may concern:

Beit known that I, SAMUEL S. BLACK, of West Alexandria, in the county of Preble and State of Ohio, have invented a new and valuable Improvement in Sewing-Machines; and

tion of a sectional view of my sewing-ma-v chine. Fig: 2 is a plan view of the saine. Figs. 3, 4, 5, 6, 7, 9, l0, 1l, 12, and 13 are detail views ofthe same.

This invention relates to shuttle sewingmachines; and consists, first, in .certain means for giving an endwise reciprocating motion to the serrated cloth-feeder, and at the same time giving vertical motion thereto, in combination with means for adjusting the length and height of strokes of this feeder; second, in a curved orbow spring pivoted to the bearing-plate of the shuttle, and constructed to serve as a catch for this plate when `closed, and also givean equal tension on the bobbin thread when drawn from all parts of the bobbin.

The following is a full description of my improvements In the annexed drawings, A represents the wcioth-plate; B, the hollow standard of the hollow overhanging bracket C, and D the vertical and hollow bracket-head. E designates the horizontal driving-shaft of the machine, which passes through the upper end of the standard B and through the bracket-arm C, and has keyed on it two eccentrics, c a', and a wheel, d, to the face of which latter a wrist-pin is fixed, which plays in a V-shaped` slot, e, and reciprocates the needle-bar F..

Theeccentric a' on shaft E rotates between the forked ends b of a lever, H, which has its fulcrum at c, and which has a ball, h, on its lower end. The ball h plays between the forked ends h1 of a horizontallever, H', which is located beneath the cloth-plate A, and has its fulcrum at la?. This lever H' receives va vibratory motion, and between its front forked ends 1t receives the tongue o of a shuttle-carrier, L. By means of a set-screw, 0.',which` passes through an oblong slot throughfithe shuttle-carriertongue o, the shuttle N, `which` y lies in the carrier, can be adjusted so); as to` slide closely against a curved slideway, J, and any wearing away of the parts can be compensated for. The eccentric al gives a vertical motion to a rod, G, the lower end of which is bentvso as to form two right angles, and is inserted loosely through the free end of a vibrating arm, I2, ixed on a shaft, I. The

rod G depresses the arm I2 when it descends,

and a spring, S, raises 4this arm when rod G ascends, until it is arrested by an adjusting thumb-screw, I3, tapped through the clothplate A, as 'shown by Fig. 9. The shaft I has its bearings in pendants I1 Il, and to it the spring S is attached `by means of an arm, g, which is adjustable by means of a set-screw. A crank-arm, j, is also secured to the shaft I, which is connected to `the transverse face-plate T of aserrated clotlrfeeder,

T', and gives endwise motion thereto. Vertical vibration is lgiven to the feed-plate T by means of an anti-friction roller on an arm, fm, keyed to a rock-shaft, K, on which roller the feed-plate T is held by means of a spring, S1, fixed at one end to the "'bottoinof the clothplate A. The shaft K has its bearings in pendants K K', and to it an arm, Z, is adjustably secured by-means of a set-screw. This abutment, p', and a front hook or` horn, p, l

which curves overthe case N near its front or pointed end, and holdsit down in place. This carrier allows the shuttle-case to settle closely in contact with the guideway J, and accommoda/ce itself thereto, `while being reciprocated, without the use of pressure-springs, set-screws, or other contrivances of this kind. The shuttle-case N has pivoted to its butt-end a plate, 4, which is constructed with bearinglips 4 4 for the shuttle-bobbin. The bearinglip nearest the pivoted end of plate 4 is perforated, and the opposite lip is slotted for readily introducing and removing the shuttle. To the inner surface of the pivoted end of plate 4 a tension-sprin g, 5, is pivoted, between which and plate 4 the thread from the bobbin is passed, and thence carried out of the case Jthrough a notch, 3. The spring 5 is bowed and fish=bellied,rand constructed with a reduced extension, 7, which engages with a notch, 6, made into one of the lipped bearings when spring 5 is in the position shown in Fig. 10. When the plate 4 is closed into the shuttlelcase, the extension 7 is received behind a catch, 2, on the inner side of the upper edge of the case, which holds the plate 4 and its tensionespring in place. The convex portion of the spring 5 does not bear against the plate 4, but only serves as the guiding-edge for allowing the thread to be drawn from the bobbin at or nearly at right' angles to its axis. The upper thread is carried from a spool applied on a stein, C1, through a fixed tension device; thence through a iixed split eye, y, to and through a split eye, q, at theupper end of the needle bar ll; thence through an eye, 54, formed in the external end of a sliiringarm, s, to and through the eye of the needle t. The stationary tension device consists of an inclined arm, @Mixed to the braclietarin C, and having a notch through its upper bent end for guiding the thread, and a spring, c3, which is bowed, as shown in Fig. 7, secured to the arm C2 at its lower end, andacted on by a thumb- V screw, c2, which presses its upper end against the thread near the notch through arm G2. The eye s4 is formed on an arm, s, which is bent around in front of the bracket-head D, so as to play through a loop or staple, t. This arm, which is made of spring-wire, is coiled so as to form a light spring, s1, which is secured, by a screw, s2, to the bracket-head inside. This constitutes the take-up device for taking up the .slack thread while sewing.

That portion of the arm s which is inclosed inside of the head D is curved, as shown in Fig. 4, and is acted on by a stud, s3, on the needle-bar at every down-stroke thereof. As the needle-bar rises, the arnl s springs outward and takes up the slack in the thread. P is the bar, to which the pressure-foot P1 is se cured, which .passes up, through the brackethead D, and has a lifting-lever, P2, pivoted to its upper end. This bar P is held-down by means of a spring, S2, which is coiled around it, and presses against lugs formed on a plate, if', that is fitted into a vertical groove inside of bracket-head. For the purpose of adjusting the tension of the spring S2 on bar P, the plate i' is secured to the front plate of the head D by means of a thumb-screw, r1, which is on the outside ot' this head D, and which passes through a slot, r2, made vertically through its front plate. By raising or depressing the plate i', which can be done when screw r1 is loosened, the spring Sican be made to act with greater or less force on the pressure-foot b'ar l). By means of a pin., k, on the pressure-bar P,which plays in a slot made vertically through the head D, this bar is prevented from turning about its axis unless the said pin 7s is raised out of the slot.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. The oscillating shaft I, connected loosely to rod Gr by means of an arm, 12, and acted on by a spring, S, and connected by a crank, j, to the feed-bar T, in combination with the depressing-spring Shand an ele\'*ating-arm, m, on a shaft, K, the latter being connected by an adjustable arm, I., and a rod, l', to a vibrating lever, H', substantially vas described.

2. 'lhe curved or bow spring 5, pivoted to he bearing-plate 4, and constructed with an extension, 7, as and for the purposes set forth.

ln testimony that I claimthe above l have hereunto subscribed my name in-the presence t' two witnesses.

SAMUEL S. BLACK. lllitncsses:

l-l. CAMPBELL, DAVID Gorn. 

